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<head><meta charset="utf-8"><title>I-prioritize #72343 Conditional jumps equivalent to if(0 != · t-compiler/wg-prioritization · Zulip Chat Archive</title></head>
<h2>Stream: <a href="https://rust-lang.github.io/zulip_archive/stream/227806-t-compiler/wg-prioritization/index.html">t-compiler/wg-prioritization</a></h2>
<h3>Topic: <a href="https://rust-lang.github.io/zulip_archive/stream/227806-t-compiler/wg-prioritization/topic/I-prioritize.20.2372343.20Conditional.20jumps.20equivalent.20to.20if(0.20!.3D.html">I-prioritize #72343 Conditional jumps equivalent to if(0 !=</a></h3>

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<a name="198047140"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/227806-t-compiler/wg-prioritization/topic/I-prioritize%20%2372343%20Conditional%20jumps%20equivalent%20to%20if%280%20%21%3D/near/198047140" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> triagebot <a href="https://rust-lang.github.io/zulip_archive/stream/227806-t-compiler/wg-prioritization/topic/I-prioritize.20.2372343.20Conditional.20jumps.20equivalent.20to.20if(0.20!.3D.html#198047140">(May 19 2020 at 10:37)</a>:</h4>
<p><span class="user-group-mention" data-user-group-id="2403">@WG-prioritization</span> issue <a href="https://github.com/rust-lang/rust/issues/72343">#72343</a> has been requested for prioritization.</p>



<a name="198048447"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/227806-t-compiler/wg-prioritization/topic/I-prioritize%20%2372343%20Conditional%20jumps%20equivalent%20to%20if%280%20%21%3D/near/198048447" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Léo Lanteri Thauvin <a href="https://rust-lang.github.io/zulip_archive/stream/227806-t-compiler/wg-prioritization/topic/I-prioritize.20.2372343.20Conditional.20jumps.20equivalent.20to.20if(0.20!.3D.html#198048447">(May 19 2020 at 10:50)</a>:</h4>
<p>Let's tag as <code>E-needs-bisection</code> and ping the LLVM-ICE-breakers?</p>



<a name="198050287"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/227806-t-compiler/wg-prioritization/topic/I-prioritize%20%2372343%20Conditional%20jumps%20equivalent%20to%20if%280%20%21%3D/near/198050287" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Léo Lanteri Thauvin <a href="https://rust-lang.github.io/zulip_archive/stream/227806-t-compiler/wg-prioritization/topic/I-prioritize.20.2372343.20Conditional.20jumps.20equivalent.20to.20if(0.20!.3D.html#198050287">(May 19 2020 at 11:11)</a>:</h4>
<p>Done</p>



<a name="198097012"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/227806-t-compiler/wg-prioritization/topic/I-prioritize%20%2372343%20Conditional%20jumps%20equivalent%20to%20if%280%20%21%3D/near/198097012" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/227806-t-compiler/wg-prioritization/topic/I-prioritize.20.2372343.20Conditional.20jumps.20equivalent.20to.20if(0.20!.3D.html#198097012">(May 19 2020 at 17:05)</a>:</h4>
<p>I'm going over <code>I-prioritize</code> issues</p>



<a name="198097022"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/227806-t-compiler/wg-prioritization/topic/I-prioritize%20%2372343%20Conditional%20jumps%20equivalent%20to%20if%280%20%21%3D/near/198097022" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/227806-t-compiler/wg-prioritization/topic/I-prioritize.20.2372343.20Conditional.20jumps.20equivalent.20to.20if(0.20!.3D.html#198097022">(May 19 2020 at 17:05)</a>:</h4>
<p>this one is pending</p>



<a name="198097030"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/227806-t-compiler/wg-prioritization/topic/I-prioritize%20%2372343%20Conditional%20jumps%20equivalent%20to%20if%280%20%21%3D/near/198097030" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/227806-t-compiler/wg-prioritization/topic/I-prioritize.20.2372343.20Conditional.20jumps.20equivalent.20to.20if(0.20!.3D.html#198097030">(May 19 2020 at 17:05)</a>:</h4>
<p>I'd say <code>P-medium</code></p>



<a name="198097096"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/227806-t-compiler/wg-prioritization/topic/I-prioritize%20%2372343%20Conditional%20jumps%20equivalent%20to%20if%280%20%21%3D/near/198097096" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/227806-t-compiler/wg-prioritization/topic/I-prioritize.20.2372343.20Conditional.20jumps.20equivalent.20to.20if(0.20!.3D.html#198097096">(May 19 2020 at 17:05)</a>:</h4>
<p>but seems like an LLVM issue</p>



<a name="198097189"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/227806-t-compiler/wg-prioritization/topic/I-prioritize%20%2372343%20Conditional%20jumps%20equivalent%20to%20if%280%20%21%3D/near/198097189" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Léo Lanteri Thauvin <a href="https://rust-lang.github.io/zulip_archive/stream/227806-t-compiler/wg-prioritization/topic/I-prioritize.20.2372343.20Conditional.20jumps.20equivalent.20to.20if(0.20!.3D.html#198097189">(May 19 2020 at 17:06)</a>:</h4>
<p><span class="user-mention silent" data-user-id="124289">Hanna Kruppe</span> did some investigation</p>



<a name="198097254"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/227806-t-compiler/wg-prioritization/topic/I-prioritize%20%2372343%20Conditional%20jumps%20equivalent%20to%20if%280%20%21%3D/near/198097254" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/227806-t-compiler/wg-prioritization/topic/I-prioritize.20.2372343.20Conditional.20jumps.20equivalent.20to.20if(0.20!.3D.html#198097254">(May 19 2020 at 17:06)</a>:</h4>
<p>yeah</p>



<a name="198097260"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/227806-t-compiler/wg-prioritization/topic/I-prioritize%20%2372343%20Conditional%20jumps%20equivalent%20to%20if%280%20%21%3D/near/198097260" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/227806-t-compiler/wg-prioritization/topic/I-prioritize.20.2372343.20Conditional.20jumps.20equivalent.20to.20if(0.20!.3D.html#198097260">(May 19 2020 at 17:06)</a>:</h4>
<blockquote>
<p>We could try filing an LLVM bug report but tbh I'm pessimistic about how easy it is to fix this and how important such a fix would be, realistically speaking. (Is this example distilled from a more realistic program? Does the redundant test cause a measurable performance problem there?)</p>
</blockquote>



<a name="198097355"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/227806-t-compiler/wg-prioritization/topic/I-prioritize%20%2372343%20Conditional%20jumps%20equivalent%20to%20if%280%20%21%3D/near/198097355" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/227806-t-compiler/wg-prioritization/topic/I-prioritize.20.2372343.20Conditional.20jumps.20equivalent.20to.20if(0.20!.3D.html#198097355">(May 19 2020 at 17:07)</a>:</h4>
<p>based on that and a later comment is why I'm saying <code>P-medium</code></p>



<a name="198097408"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/227806-t-compiler/wg-prioritization/topic/I-prioritize%20%2372343%20Conditional%20jumps%20equivalent%20to%20if%280%20%21%3D/near/198097408" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Léo Lanteri Thauvin <a href="https://rust-lang.github.io/zulip_archive/stream/227806-t-compiler/wg-prioritization/topic/I-prioritize.20.2372343.20Conditional.20jumps.20equivalent.20to.20if(0.20!.3D.html#198097408">(May 19 2020 at 17:08)</a>:</h4>
<p>I agree, it's been there for a long time and it's probably not really actionable on our part</p>



<a name="198097922"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/227806-t-compiler/wg-prioritization/topic/I-prioritize%20%2372343%20Conditional%20jumps%20equivalent%20to%20if%280%20%21%3D/near/198097922" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> triagebot <a href="https://rust-lang.github.io/zulip_archive/stream/227806-t-compiler/wg-prioritization/topic/I-prioritize.20.2372343.20Conditional.20jumps.20equivalent.20to.20if(0.20!.3D.html#198097922">(May 19 2020 at 17:11)</a>:</h4>
<p>Issue <a href="https://github.com/rust-lang/rust/issues/72343">#72343</a>'s prioritization request has been removed.</p>



<hr><p>Last updated: Aug 07 2021 at 22:04 UTC</p>
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